scholarly journals Adaptive divergence and the evolution of hybrid trait mismatch in threespine stickleback

2022 ◽  
Author(s):  
Avneet K. Chhina ◽  
Ken A. Thompson ◽  
Dolph Schluter
Keyword(s):  
Threespine Stickleback ◽  
Adaptive Divergence

scholarly journals Contemporary ancestor? Adaptive divergence from standing genetic variation in Pacific marine threespine stickleback

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Matthew R. J. Morris ◽  
Ella Bowles ◽  
Brandon E. Allen ◽  
Heather A. Jamniczky ◽  
Sean M. Rogers
Keyword(s):  
Genetic Variation ◽  
Threespine Stickleback ◽  
Adaptive Divergence

scholarly journals Should I stay or should I go? The Ectodysplasin locus is associated with behavioural differences in threespine stickleback

2009 ◽  
Vol 5 (6) ◽  
pp. 788-791 ◽  
Author(s):  
Rowan D. H. Barrett ◽  
Tim H. Vines ◽  
Jason S. Bystriansky ◽  
Patricia M. Schulte
Keyword(s):  
Positive Selection ◽  
Local Adaptation ◽  
Morphological Traits ◽  
Genetic Basis ◽  
Natural Populations ◽  
Threespine Stickleback ◽  
Adaptive Divergence ◽  
Freshwater Habitats ◽  
Repeated Evolution ◽  
Freshwater Environments

Adaptive divergence may be facilitated if morphological and behavioural traits associated with local adaptation share the same genetic basis. It is therefore important to determine whether genes underlying adaptive morphological traits are associated with variation in behaviour in natural populations. Positive selection on low-armour alleles at the Ectodysplasin ( Eda ) locus in threespine stickleback has led to the repeated evolution of reduced armour, following freshwater colonization by fully armoured marine sticklebacks. This adaptive divergence in armour between marine and freshwater populations would be facilitated if the low allele conferred a behavioural preference for freshwater environments. We experimentally tested whether the low allele is associated with preference for freshwater by measuring the preference of each Eda genotype for freshwater versus saltwater after acclimation to either salinity. We found no association between the Eda low allele and preference for freshwater. Instead, the low allele was significantly associated with a reduced preference for the acclimation environment. This behaviour may facilitate the colonization of freshwater habitats from the sea, but could also hinder local adaptation by promoting migration of low alleles between marine and freshwater environments.

QUANTIFYING THE CONSTRAINING INFLUENCE OF GENE FLOW ON ADAPTIVE DIVERGENCE IN THE LAKE-STREAM THREESPINE STICKLEBACK SYSTEM

Evolution ◽  
2007 ◽  
Vol 61 (8) ◽  
pp. 2015-2026 ◽  
Author(s):  
Jean-Sébastien Moore ◽  
Jennifer L. Gow ◽  
Eric B. Taylor ◽  
Andrew P. Hendry
Keyword(s):  
Gene Flow ◽  
Threespine Stickleback ◽  
Adaptive Divergence

scholarly journals Regulatory architecture of gene expression variation in the threespine stickleback, Gasterosteus aculeatus

2016 ◽  
Author(s):  
Victoria L. Pritchard ◽  
Heidi M. Viitaniemi ◽  
R.J. Scott McCairns ◽  
Juha Merilä ◽  
Mikko Nikinmaa ◽  
...  
Keyword(s):  
Gene Expression ◽  
Regulatory Networks ◽  
Gasterosteus Aculeatus ◽  
Genotyping By Sequencing ◽  
Interval Mapping ◽  
Threespine Stickleback ◽  
Adaptive Divergence ◽  
Gene Expression Variation ◽  
Expression Variation ◽  
Regulatory Architecture

Much adaptive evolutionary change is underlain by mutational variation in regions of the genome that regulate gene expression rather than in the coding regions of the genes themselves. An understanding of the role of gene expression variation in facilitating local adaptation will be aided by an understanding of underlying regulatory networks. Here, we characterize the genetic architecture of gene expression variation in the threespine stickleback (Gasterosteus aculeatus), an important model in the study of adaptive evolution. We collected transcriptomic and genomic data from 60 half-sib families using an expression microarray and genotyping-by-sequencing, and located QTL underlying the variation in gene expression (eQTL) in liver tissue using an interval mapping approach. We identified eQTL for several thousand expression traits. Expression was influenced by polymorphism in both cis and trans regulatory regions. Trans eQTL clustered into hotspots. We did not identify master transcriptional regulators in hotspot locations: rather, the presence of hotspots may be driven by complex interactions between multiple transcription factors. One observed hotspot co-located with a QTL recently found to underlie salinity tolerance in the threespine stickleback. However, most other observed hotspots did not co-locate with regions of the genome known to be involved in adaptive divergence between marine and freshwater habitats.

Adaptive Divergence of Trophic Phenotype among Freshwater Populations of the Threespine Stickleback (Gasterosteus aculeatus)

1986 ◽  
Vol 43 (12) ◽  
pp. 2455-2463 ◽  
Author(s):  
P. A. Lavin ◽  
J. D. McPhail
Keyword(s):  
Water Column ◽  
Gasterosteus Aculeatus ◽  
Drainage System ◽  
Stomach Contents ◽  
Open Water ◽  
Threespine Stickleback ◽  
Adaptive Divergence ◽  
Population Divergence ◽  
Foraging Success ◽  
Trophic Resources

We investigated differences in the morphological and behavioural contributions to foraging success among three morphotypes (open-water, littoral, and intermediate) of the threespine stickleback (Gasterosteus aculeatus) from a single drainage system on Vancouver Island. Stomach contents from wild samples showed diet to be dependent on morphotype. Interpopulation differences in trophic morphology were associated with differences in foraging success on given prey types. The longer jaw of the bottom-browsing littoral morphotype allowed it to ingest significantly larger prey then either the intermediate or open-water populations. In addition, the littoral type spent less time manipulating benthic prey then either the open-water or intermediate morphotype. The latter observation is independent of interpopulation differences in jaw length. Both the planktivorous open-water morphotype and intermediate morphotypes were superior foragers in experiments on water column prey. The differences in water column foraging success are associated with interpopulation differences in gill raker morphology. Our results support the conclusion that inter population divergence in trophic phenotype is an adaptive response to differences in the primary trophic resources available in lakes of different morphometry.

scholarly journals Adaptive divergence and the evolution of hybrid phenotypes in threespine stickleback

2020 ◽  
Author(s):  
Avneet K. Chhina ◽  
Ken A. Thompson ◽  
Dolph Schluter
Keyword(s):  
Reproductive Isolation ◽  
Phenotypic Variation ◽  
Gasterosteus Aculeatus ◽  
Threespine Stickleback ◽  
Adaptive Divergence ◽  
Phenotypic Traits ◽  
Ancestral State ◽  
Ecological Divergence ◽  
Critical Determinant ◽  
Phenotypic Distance

AbstractThe fitness of hybrids is a critical determinant of gene flow between hybridizing populations. If hybrid phenotypes change predictably as parental populations become increasingly divergent, this could provide insight into general mechanisms linking ecological divergence with reproductive isolation. In this study, we used threespine stickleback fish (Gasterosteus aculeatus L.) to examine how phenotypic divergence between populations drives the evolution of dominance, phenotypic variation, and trait ‘mismatch’ in hybrids. We generated F1 and F2 hybrids between 12 freshwater populations—which ranged from highly planktivorous to highly benthic-feeding—and an anadromous population that is highly planktivorous and resembles the ancestral state of derived freshwater populations. We measured 16 phenotypic traits in hybrids and pure parental individuals raised under common conditions. We found that dominance varied markedly among traits. By contrast, dominance for a given trait was typically consistent among populations except for two traits where dominance was predicted by the phenotype of the freshwater parent. We find that multivariate phenotypic variation is greater in hybrids between more divergent parents. Finally, we demonstrate that the extent to which parental traits are ‘mismatched’ in both F1 and F2 hybrids increases with the phenotypic distance between the parent populations. Critically, this relationship was clearer in F1 hybrids than in F2s—largely due to traits having different dominance coefficients and F1s having relatively little phenotypic variation. Our results demonstrate that some aspects of hybrid phenotypes evolve predictably as parental populations diverge. We also find evidence for a possible general mechanistic link between ecological divergence and reproductive isolation—that more divergent parent populations tend to produce hybrids with novel and potentially deleterious multivariate phenotypes.

REPLICATED EVOLUTION OF INTEGRATED PLASTIC RESPONSES DURING EARLY ADAPTIVE DIVERGENCE

Evolution ◽  
2006 ◽  
Vol 60 (4) ◽  
pp. 801 ◽  
Author(s):  
Kevin J. Parsons ◽  
Beren W. Robinson
Keyword(s):  
Adaptive Divergence ◽  
Plastic Responses
Sign in / Sign up

Export Citation Format

Share Document